Inkjet recording device, temperature control method, and program

Abstract

The present invention provides an inkjet recording apparatus, a temperature control method, and a program that enable more efficient heat dissipation from the transport unit that transports the recording medium. [Solution] The inkjet recording apparatus 1 includes a head unit 25 comprising a transport unit 21 for transporting a recording medium, a heating unit 23 for heating the transport unit 21 to a first temperature, a first measuring unit 24 for measuring the temperature of the transport unit 21, a plurality of inkjet heads 251, an ink heating device 253 which is a heating device for heating the ink supplied to the plurality of inkjet heads 251, and a carriage 252 on which the plurality of inkjet heads 251 and the ink heating device 253 are mounted, and a control unit 40 which, when the temperature of the transport unit 21 is higher than a second temperature which is higher than the first temperature, interrupts the image forming process and executes control to reduce the rotation speed of the transport unit 21 and / or control to move the carriage 252 away from the transport unit 21.

Description

Technical Field

[0001] The present invention relates to an inkjet recording apparatus, a temperature control method, and a program.

Background Art

[0002] Conventionally, an inkjet recording apparatus that ejects ink from an inkjet head onto a recording medium conveyed by a conveyance unit to record an image is known.

[0003] In image formation using ink, depending on the temperature of the recording medium, the amount of thermal shrinkage of the recording medium, the drying rate of the ink, the penetration degree, the landing position, the viscosity, etc. change, and the image quality also changes accordingly. Therefore, by controlling the temperature of the conveyance unit that conveys the recording medium, the image quality of the image formed on the recording medium can be stabilized.

[0004] For example, Patent Document 1 describes a configuration for stabilizing the image quality of an image formed by controlling a heating unit that heats a rotating drum, which is a conveyance unit. Specifically, when the temperature of the rotating drum that conveys the recording medium is higher than the set temperature, the heating unit that heats the rotating drum is turned off, and when the temperature of the rotating drum is below the set temperature, the heating unit is turned on.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in inkjet recording devices, the rotating drum may be heated not only by the heating unit but also by other components. Therefore, simply turning off the heating unit when the temperature of the rotating drum is higher than the set temperature may not be sufficient, as the heat dissipation of the rotating drum (transport unit) may take time due to the influence of these other components.

[0007] This invention has been made in view of the above circumstances. Its purpose is to provide an inkjet recording apparatus, a temperature control method, and a program that can more efficiently dissipate heat from a transport unit that transports a recording medium. [Means for solving the problem]

[0008] To solve the above problems, the invention described in claim 1 is: An inkjet recording apparatus that performs image forming processing by ejecting ink onto a recording medium, A transport unit that transports recording media by rotating around a rotation axis, A heating unit that heats the transport unit to a first temperature, A first measuring unit for measuring the temperature of the transport unit, A head unit comprising: multiple inkjet heads; a heating device for heating the ink ejected by the multiple inkjet heads; and a carriage on which the multiple inkjet heads and the heating device are mounted. The system includes a control unit that, when the temperature of the transport unit is higher than a second temperature (higher than the first temperature), interrupts the image forming process and performs control to reduce the rotational speed of the transport unit and / or to move the carriage away from the transport unit.

[0009] The invention described in claim 2 is an inkjet recording apparatus as described in claim 1, If the temperature of the transport unit is equal to or higher than the second temperature, the control unit interrupts the image forming process and reduces the rotational speed of the transport unit. If the temperature of the transport unit after a predetermined time has elapsed since the interruption of the image forming process is equal to or higher than the third temperature, which is lower than the first temperature, the control unit separates the carriage from the transport unit.

[0010] The invention described in claim 3 is an inkjet recording apparatus according to claim 1 or 2, The control unit restarts the interrupted image forming process when the temperature of the transport unit falls below a third temperature, which is lower than the first temperature.

[0011] The invention described in claim 4 is an inkjet recording apparatus according to claim 1 or 2, The aforementioned plurality of inkjet heads eject sol-gel phase-transition ink.

[0012] The invention described in claim 5 is an inkjet recording apparatus according to claim 1 or 2, An irradiation unit for irradiating the recording medium with energy rays is provided downstream of the head unit in the transport direction. The aforementioned plurality of inkjet heads eject photocurable ink, When the control unit separates the carriage from the transport unit, it separates the irradiation unit from the transport unit.

[0013] The invention described in claim 6 is an inkjet recording apparatus according to claim 1 or 2, It includes a second measuring unit for measuring the temperature of the carriage, The control unit controls the heating device based on the measurement value of the second measuring unit.

[0014] The invention described in claim 7 is an inkjet recording apparatus as described in claim 6, The control unit controls the heating device and the heating unit so that the measurement value of the first measuring unit becomes lower than the measurement value of the second measuring unit.

[0015] The invention according to claim 8 is an inkjet recording apparatus according to claim 1 or 2, when the control unit separates the carriage from the transport unit, the heating unit is separated from the transport unit.

[0016] The invention according to claim 9 is a transport unit that transports a recording medium by rotating around a rotation axis, a heating unit that heats the transport unit to a first temperature, a first measurement unit that measures the temperature of the transport unit, a head unit including a plurality of inkjet heads, a heating device that heats ink ejected from the plurality of inkjet heads, and a carriage on which the plurality of inkjet heads and the heating device are mounted, and an inkjet recording apparatus that performs an image forming process of forming an image by ejecting ink onto a recording medium, and a temperature control method thereof, when the temperature of the transport unit is equal to or higher than a second temperature higher than the first temperature, the image forming process is interrupted, and a control step of reducing the rotation speed of the transport unit and / or separating the carriage from the transport unit is provided.

[0017] The invention according to claim 10 is a program, a transport unit that transports a recording medium by rotating around a rotation axis, a heating unit that heats the transport unit to a first temperature, a first measurement unit that measures the temperature of the transport unit, a head unit including a plurality of inkjet heads, a heating device that heats ink ejected from the plurality of inkjet heads, and a carriage on which the plurality of inkjet heads and the heating device are mounted, and a computer of an inkjet recording apparatus that performs an image forming process of forming an image by ejecting ink onto a recording medium, When the temperature of the conveyance unit is at a second temperature or higher, which is higher than the first temperature, the control unit functions as a control unit that interrupts the image forming process and executes control to reduce the rotation speed of the conveyance unit and / or control to separate the carriage from the conveyance unit.

Advantages of the Invention

[0018] According to the present invention, the conveyance unit that conveys the recording medium can be more efficiently cooled.

Brief Description of the Drawings

[0019] [Figure 1] It is a side view of the inkjet recording apparatus as seen from the width direction. [Figure 2] It is a block diagram of the inkjet recording apparatus. [Figure 3] It is a flowchart of the image forming process.

Embodiments for Carrying Out the Invention

[0020] Hereinafter, the inkjet recording apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples. In the following description, components having the same functions and configurations are denoted by the same reference numerals, and their descriptions are omitted.

[0021] [Overall Configuration of Inkjet Recording Apparatus] FIG. 1 is a side cross-sectional view showing the main configuration of the inkjet recording apparatus 1. Further, FIG. 2 is a block diagram showing the functional configuration of the inkjet recording apparatus 1. The inkjet recording apparatus 1 includes a paper feeding unit 10, an image forming unit 20, a paper discharging unit 30, a control unit 40, and the like.

[0022] In the following, the X direction, Y direction, and Z direction refer to the directions shown in FIG. 1. Further, in the following, the X direction, Y direction, and Z direction will be described as the width direction, conveyance direction, and height direction, respectively.

[0023] (Paper Feeding Unit) The paper feeding unit 10 stores the recording medium before image formation. Under the control of the control unit 40, the paper feeding unit 10 transports the recording medium to the image forming unit 20. The paper feeding unit 10 includes a paper feeding tray 11 and a transport unit 12, etc.

[0024] {paper tray} The paper feed tray 11 is a plate-shaped member that stores recording media. The paper feed tray 11 is provided to hold one or more recording media. The paper feed tray 11 moves up and down according to the amount of recording media placed on it. Through this up and down movement, the paper feed tray 11 is held in a position where the uppermost recording media is transported by the transport unit 12.

[0025] {Conveyor section} The transport unit 12 transports the recording medium from the paper feed tray 11 to the image forming unit 20. The transport unit 12 is equipped with a transport mechanism. The transport mechanism drives a belt 123 to transport the recording medium on the belt 123. The belt 123 is ring-shaped, and the inside of the ring is supported by a plurality of rollers 121 and 122.

[0026] The transport unit 12 includes a supply unit. The supply unit transfers the top recording medium placed on the paper feed tray 11 onto the belt 123. The transport unit 12 then transports the recording medium along the belt 123 using the supply unit.

[0027] (Image forming unit) The image forming unit 20 performs recording operations on the recording medium under the control of the control unit 40. The image forming unit 20 includes a transport unit 21, a transfer unit 22, a heating unit 23, a first measuring unit 24, a head unit 25, an irradiation unit 26, and a delivery unit 27, etc.

[0028] {transport unit} The transport unit 21 forms an image on the recording medium by transporting it so that it passes below the head unit 25 as it rotates around a rotation axis that extends in the width direction. The transport unit 21 is, for example, a cylindrical transport drum. The transport surface of the transport unit 21 faces the heating unit 23, the head unit 25, and the irradiation unit 26.

[0029] {Transfer Unit} The transfer unit 22 is positioned between the transport unit 12 and the transport unit 21. The transfer unit 22 includes a claw portion 221 and a transfer drum 222, etc.

[0030] The claw portion 221 is a cylindrical member that supports one end of the recording medium conveyed by the conveying portion 12. The transfer drum 222 is a member that guides the recording medium supported by the claw portion 221.

[0031] The transfer unit 22 picks up the recording medium on the transport unit 12 with its claw portion 221 and places it along the outer surface of the transfer drum 222. Through this operation, the transfer unit 22 transfers the recording medium to the transport unit 21.

[0032] {Heating part} The heating unit 23 is equipped with, for example, a heating element and generates heat in response to the application of electricity. The heating unit 23 is a drum heater controlled by the control unit 40 to heat the transport unit 21 to a predetermined temperature. The heating unit 23 is located near the outer surface of the transport unit 21 and is positioned upstream of the head unit 25 in the transport direction of the recording medium. The heating unit 23 is provided with a movable part 231, which is configured to move away from the transport unit 21 under the control of the control unit 40.

[0033] {1st measurement section} The first measuring unit 24 is a temperature sensor located near the transport unit 21 and the heating unit 23. It measures the temperature of the transport unit 21 and transmits the measurement result to the control unit 40. The control unit 40 controls the heat generation of the heating unit 23 based on the temperature of the transport unit 21 obtained from the first measuring unit 24.

[0034] {Head Unit} The head unit 25 ejects ink onto the recording medium P to form an image based on the print job and image data received from the control unit 40. In this embodiment, the head unit 25 is provided with a carriage 252 on which a plurality of inkjet heads 251 corresponding to each of the colors C (cyan), M (magenta), Y (yellow), and K (black) are arranged in the width direction. The carriage 252 is also equipped with an ink heating device 253 and a second measuring unit 254.

[0035] <Inkjet head> Each inkjet head 251 is equipped with a tank for colored ink, a flow path, a piezoelectric element, and multiple nozzles. The inkjet head 251 is also connected to a main tank (not shown) via an ink heating device 253, and is supplied with ink that has been sent from the main tank and heated by the ink heating device 253. The control unit 40 displaces (deforms) the piezoelectric element by applying a drive signal generated by a drive unit (not shown), and applies pressure to the ink supplied from the tank to the nozzles via the flow path, thereby ejecting the ink from the nozzles.

[0036] <carriage> The carriage 252 has, for example, a belt stretched between two pulleys that are rotated by a motor (not shown). As described above, the carriage 252 is equipped with multiple inkjet heads 251, an ink heating device 253, and a second measuring unit 254. The carriage 252 scans in the width direction by the rotational operation of the motor based on a drive signal output by the control unit 40.

[0037] The head unit 25 forms an image by ejecting ink onto the transported recording medium P from a carriage 252 whose width is longer than the recording medium P. In other words, the inkjet recording device 1 is a line head type inkjet recording device.

[0038] The ink ejected by the head unit 25 is, for example, an ultraviolet-curable ink. The ultraviolet-curable ink is a gel-like ink that undergoes a phase change between a gel state and a liquid (sol) state depending on the temperature when ultraviolet light is not irradiated from the irradiation unit 26. The sol-gel phase transition temperature of the ultraviolet-curable ink is preferably in the range of 40 to 70°C, and more preferably in the range of 50 to 65°C.

[0039] {ink heating device} The ink heating device 253 is made of, for example, aluminum, and is a heating device that heats the ink supplied from the main tank to the inkjet head 251 under the control of the control unit 40.

[0040] The temperature at which the ink heating device 253 heats the ink is higher than the temperature at which the heating unit 23 heats the transport unit 21. Furthermore, since the ink heating device 253 is mounted on the carriage 252, the carriage 252 is heated by the ink heating device 253. Therefore, if the carriage 252 is located near the transport unit 21 during image formation, the temperature of the transport unit 21 rises due to the carriage 252 heated by the ink heating device 253.

[0041] {Second measurement section} The second measuring unit 254 measures the temperature of the carriage 252 and transmits it to the control unit 40. The control unit 40 controls the output of the ink heating device 253 based on the measurement results from the second measuring unit 254.

[0042] {Irradiation area} The irradiation unit 26 is equipped with a fluorescent tube, such as a low-pressure mercury lamp. The irradiation unit 26 irradiates energy rays, such as ultraviolet rays, through the emission of light from the fluorescent tube. During the process of irradiating with such energy rays, part of the energy is converted into heat and the irradiation unit 26 generates heat, thus acting as a heating unit to heat the transport unit 21. The irradiation unit 26 is provided near the outer surface of the transport unit 21. Furthermore, the irradiation unit 26 is positioned downstream of the head unit 25 in the transport direction of the recording medium. The irradiation unit 26 irradiates the recording medium from which the ink has been ejected with energy rays. The ink on the recording medium hardens due to the action of these energy rays. The irradiation unit 26, like the heating unit 23, is equipped with a moving part 261 and is configured to move in a direction away from the transport unit 21 under the control of the control unit 40.

[0043] Furthermore, the fluorescent tubes that emit ultraviolet light are not limited to low-pressure mercury lamps. The fluorescent tubes may be, for example, mercury lamps with an operating pressure of several hundred Pa to approximately 1 MPa. Alternatively, the fluorescent tubes may be light sources usable as germicidal lamps, such as cold cathode fluorescent lamps, ultraviolet laser light sources, metal halide lamps, or light-emitting diodes. Among these, it is desirable that the fluorescent tubes be light sources capable of emitting ultraviolet light at a higher intensity and with low power consumption. Examples of such fluorescent tubes include light-emitting diodes. The energy rays are not limited to ultraviolet light; any energy ray that has the property of curing ink, depending on the properties of the ink, is acceptable. The light source is also substituted according to the energy ray.

[0044] The above example illustrates the case where the head unit 25 ejects UV-curing ink, but it is not limited to this. The ink ejected by the head unit 25 may be water-based ink or other types of ink.

[0045] {Delivery Department} The delivery unit 27 is equipped with a transport mechanism. The transport mechanism transports the recording medium by driving a ring-shaped belt 273, which is supported on the inside by a plurality of rollers 271 and 272. The delivery unit 27 is equipped with a cylindrical transfer roller 274. The transfer roller 274 transfers the recording medium from the transport unit 21 to the transport mechanism. The delivery unit 27 transports the recording medium that has been transferred onto the belt 273 by the transfer roller 274 and sends it to the paper discharge unit 30.

[0046] (Paper output section) The paper discharge unit 30 discharges the recording medium on which the image was formed in the image forming unit 20. The paper output unit 30 includes a plate-shaped paper output tray 31, etc. The recording medium sent out from the image forming unit 20 by the delivery unit 27 is placed on the paper output tray 31. The paper output unit 30 stores the recording medium until the user removes it.

[0047] (Control Unit) The control unit 40 controls each component of the inkjet recording device 1. As shown in Figure 2, the control unit 40 is connected to each component of the inkjet recording device 1. The control unit 40 includes a CPU (Central Processing Unit) 41, RAM (Random Access Memory) 42, and ROM (Read Only Memory) 43, etc.

[0048] The CPU 41 reads and executes various programs and data from storage devices such as the ROM 43 according to the processing content. The CPU 41 controls the operation of each part of the inkjet recording device 1 according to the executed processing content. The RAM 42 temporarily stores various programs and data processed by the CPU 41. The ROM 43 stores various programs and data read by the CPU 41, etc.

[0049] [Temperature control] The temperature control of the transport unit 21 by the control unit 40 in the image formation process of the inkjet recording apparatus 1 described above will be explained based on the flowchart in Figure 3.

[0050] For example, when the inkjet recording device 1 starts up and acquires a print job, the control unit 40 rotates the transport unit 21 at the speed required for image formation (step S101). The control unit 40 also drives the heating unit 23 and the ink heating device 253 (step S102). Then, the control unit 40 moves the carriage 252 in a direction that brings it closer to the transport unit 21 in order for the head unit 25 to perform image formation (step S103).

[0051] The control unit 40 determines, based on the measurement results of the first measurement unit 24, whether the temperature of the transport unit 21 has reached or exceeded a control value, a first temperature T1 (step S104). The first temperature T1 is a preferred set temperature for the transport unit 21 to transport the recording medium. If the temperature of the transport unit 21 is not at or above the first temperature T1 (step S104; No), the control unit 40 continues to wait until the temperature of the transport unit 21 reaches or exceeds the first temperature T1. If the temperature of the transport unit 21 reaches or exceeds the first temperature T1 (step S104; Yes), the control unit 40 starts the image forming process (print job) (step S105).

[0052] As described above, the carriage 252 is equipped with an ink heating device 253, and the amount of heat generated by the ink heating device 253 on the carriage 252 is greater than the amount of heat generated by the heating unit 23 on the transport unit 21. Therefore, if the image forming process is continued with the carriage 252 in close proximity to the transport unit 21, the temperature of the transport unit 21 will gradually rise due to the carriage 252 (ink heating device 253). If the temperature rise of the transport unit 21 is left unchecked, the temperature of the transport unit 21 may fall outside the set temperature range, potentially degrading the image quality of the formed image.

[0053] Therefore, if the image formation process is not completed (Step S106; No), and the temperature of the transport unit 21 rises to a second temperature T2 or higher, which is higher than the first temperature T1 (Step S107; Yes), the control unit 40 interrupts the image formation process. The control unit 40 then rotates the transport unit 21 at a lower speed than during image formation (Step S108).

[0054] By interrupting the image formation process, idling control is performed to promote heat dissipation from the transport unit 21. Although the rotation speed of the transport unit 21 does not affect the heat dissipation rate of the transport unit 21, by not stopping the rotation, it is possible to suppress localized overheating of the transport unit 21 due to heat sources such as the carriage 252 and heating unit 23. Furthermore, by reducing the rotation speed of the transport unit 21, the generation of operating noise and vibration, as well as power consumption, can be suppressed.

[0055] After a predetermined time (step S109; Yes), the control unit 40 determines, based on the measurement results of the first measuring unit 24, whether the temperature of the transport unit 21 has fallen below a predetermined third temperature T3, which is lower than the first temperature T1 (step S110). If the temperature of the transport unit 21 has not fallen below the third temperature T3 (step S110; No), the control unit 40 moves the carriage 252 that is heating the transport unit 21 away from the transport unit 21 (step S111).

[0056] In this way, by separating the carriage 252 (ink heating device 253), which has a greater heat output than the heating unit 23 and can act as a heating unit to heat the transport unit 21, from the transport unit 21, heat dissipation from the transport unit 21 can be made more efficient. On the other hand, moving the carriage 252 requires both time and power. Therefore, by performing this action after waiting for a predetermined time, rather than immediately after interrupting the image forming process, the time and power loss that would occur if separating the carriage 252 were unnecessary can be suppressed.

[0057] When the temperature of the transport unit 21 falls below the third temperature T3 (steps S110, S112; Yes), the control unit 40 restores the rotation speed of the transport unit 21 to its original value and resumes the image forming process (step S113), and continues to execute it until completion. When transitioning from step S112 to step S113, the carriage 252 is brought closer to the transport unit 21 again.

[0058] [Effects of the Embodiment] As described above, in this embodiment, the inkjet recording apparatus 1 interrupts the image forming process when the temperature of the transport unit 21 is above the second temperature. The rotational speed of the transport unit 21 is reduced, and the carriage 252 is moved away from the transport unit 21. With this configuration, not only is the image forming process interrupted, but the carriage 252, which is the heating part that heats the transport unit 21, is moved away, so the transport unit 21 can be cooled more efficiently.

[0059] Furthermore, in this embodiment, if the temperature of the transport unit 21 a predetermined time after the interruption of the image forming process is a third temperature or higher, which is lower than the second temperature, the inkjet recording apparatus 1 separates the carriage 252 from the transport unit 21. With this configuration, the waste of time and power can be suppressed when separating the carriage 252 is unnecessary.

[0060] [Differentiations, etc.] Although the present invention has been described in detail based on embodiments of the present invention, the present invention is not limited to the embodiments described above. It goes without saying that the present invention can be modified in various ways, including within the scope of the claims and its equivalents.

[0061] For example, in the above configuration, the carriage 252 is separated from the transport unit 21 after a predetermined time has elapsed since the interruption of the image forming process and the temperature of the transport unit 21 is 3 or higher. However, the configuration is not limited to this. If the priority is on increasing the heat dissipation rate of the transport unit 21, the control unit 40 may separate the carriage 252 from the transport unit 21 when the temperature of the transport unit 21 reaches 1 or higher and the image forming process is interrupted. At this time, the transport speed of the transport unit 21 may or may not be reduced.

[0062] Furthermore, as described above, the rotational speed of the transport unit 21 does not affect the heat dissipation rate of the transport unit 21. The reduction in rotational speed is solely for the purpose of suppressing localized overheating of the transport unit 21, as well as suppressing the generation of operating noise and vibration, and power consumption. Therefore, the rotational speed of the transport unit 21 may be left as is if necessary.

[0063] Furthermore, although the above example illustrates a configuration in which only the carriage 252 is separated from the transport unit 21, the configuration is not limited to this. As described above, the heating unit 23 and the irradiation unit 26 also heat the transport unit 21 and are equipped with movable parts 231 and 261, respectively. Therefore, the control unit 40 may control these movable parts 231 and 261 to separate the heating unit 23 and the irradiation unit 26 from the transport unit 21, similar to the carriage 252, thereby enabling more efficient heat dissipation from the transport unit 21.

[0064] Furthermore, while the above example illustrates an ink heating device 253 that heats the ink supplied to the inkjet head 251 as a heating device for heating the ink ejected by the inkjet head 251, the configuration of the heating device is not limited to this. For example, the ink ejected by the inkjet head 251 may be heated by heating the inkjet head 251 or the carriage 252.

[0065] Furthermore, although the above example illustrates the application of the present invention to a drum-transport inkjet recording device 1, using a cylindrical transport drum as the transport unit 21, the invention is not limited to this. For example, the configuration of the present invention can be similarly applied to a belt-transport inkjet recording device 1, in which an endless belt that rotates in the transport direction is used as the transport unit 21.

[0066] Furthermore, while the above describes examples in which hard disks, semiconductor non-volatile memory, etc., are used as ROMs as computer-readable media for the program according to the present invention, the invention is not limited to these examples. Portable recording media such as CD-ROMs can also be used as other computer-readable media. In addition, carrier waves can be used as a medium for providing the data of the program according to the present invention via a communication line. [Explanation of Symbols]

[0067] 1. Inkjet recording device 21 Conveyor Unit 23 Heating section 24 1st measurement section 251 Inkjet Head 252 Carriage 253 Ink heating device (heating device) 254 2nd measurement section 26 Irradiation area 40 Control Unit

Claims

1. An inkjet recording apparatus that performs image forming processing by ejecting ink onto a recording medium, A transport unit that transports recording media by rotating around a rotation axis, A heating unit that heats the transport unit to a first temperature, A first measuring unit for measuring the temperature of the transport unit, A head unit comprising: multiple inkjet heads; a heating device for heating the ink ejected by the multiple inkjet heads; and a carriage on which the multiple inkjet heads and the heating device are mounted. An inkjet recording apparatus comprising: a control unit that, when the temperature of the transport unit is higher than a second temperature, which is higher than the first temperature, interrupts the image forming process and performs control to reduce the rotational speed of the transport unit and / or control to move the carriage away from the transport unit.

2. The inkjet recording apparatus according to claim 1, wherein the control unit interrupts the image forming process and reduces the rotational speed of the transport unit when the temperature of the transport unit is equal to or higher than the second temperature, and separates the carriage from the transport unit when the temperature of the transport unit after a predetermined time has elapsed since the interruption of the image forming process is equal to or higher than the third temperature which is lower than the first temperature.

3. The inkjet recording apparatus according to claim 1 or 2, wherein the control unit restarts the interrupted image forming process when the temperature of the transport unit falls below a third temperature which is lower than the first temperature.

4. The inkjet recording apparatus according to claim 1 or 2, wherein the plurality of inkjet heads eject sol-gel phase transition ink.

5. An irradiation unit for irradiating the recording medium with energy rays is provided downstream of the head unit in the transport direction. The aforementioned plurality of inkjet heads eject photocurable ink, The inkjet recording apparatus according to claim 1 or 2, wherein the control unit separates the irradiation unit from the transport unit when separating the carriage from the transport unit.

6. It includes a second measuring unit for measuring the temperature of the carriage, The inkjet recording apparatus according to claim 1 or 2, wherein the control unit controls the heating device based on the measurement value of the second measuring unit.

7. The inkjet recording apparatus according to claim 6, wherein the control unit controls the heating device and the heating unit so that the measurement value of the first measurement unit becomes lower than the measurement value of the second measurement unit.

8. The inkjet recording apparatus according to claim 1 or 2, wherein the control unit separates the heating unit from the transport unit when separating the carriage from the transport unit.

9. A transport unit that transports recording media by rotating around a rotation axis, A heating unit that heats the transport unit to a first temperature, A first measuring unit for measuring the temperature of the transport unit, A temperature control method for an inkjet recording apparatus that performs image forming processing by ejecting ink onto a recording medium, comprising a head unit comprising a plurality of inkjet heads, a heating device for heating the ink ejected by the plurality of inkjet heads, and a carriage on which the plurality of inkjet heads and the heating device are mounted, A temperature control method comprising a control step of interrupting the image forming process and reducing the rotational speed of the transport unit and / or moving the carriage away from the transport unit when the temperature of the transport unit is higher than a second temperature, which is higher than the first temperature.

10. A transport unit that transports recording media by rotating around a rotation axis, A heating unit that heats the transport unit to a first temperature, A first measuring unit for measuring the temperature of the transport unit, A computer for an inkjet recording apparatus that performs image forming processing by ejecting ink onto a recording medium comprises a head unit comprising a plurality of inkjet heads, a heating device for heating the ink ejected by the plurality of inkjet heads, and a carriage on which the plurality of inkjet heads and the heating device are mounted, A program that functions as a control unit that, when the temperature of the transport unit is higher than a second temperature (higher than the first temperature), interrupts the image forming process and performs control to reduce the rotational speed of the transport unit and / or controls to move the carriage away from the transport unit.

Images